📧 Email & Communication Comparison
Customer.io vs MailerLite
A detailed comparison to help you choose the right tool for your needs.
Last updated: 2026-02-05
Customer.io
From $100/mo
Strengths
- + Powerful segmentation
- + Multi-channel (email, SMS, push)
- + Great for product-led growth
Weaknesses
- − Expensive for small lists
- − Steep learning curve
MailerLite
Free up to 1k subs, paid from $9/mo
Strengths
- + 5x cheaper than Mailchimp for comparable features
- + Free tier covers 1,000 subscribers with full email builder
- + Drag-and-drop editor that actually produces good-looking emails
Weaknesses
- − Automation is simpler than ConvertKit or Customer.io
- − Fewer native integrations — may need Zapier for your stack
The verdict
Which one is right for you?
Choose Customer.io if you want
- → Powerful segmentation
- → Multi-channel (email, SMS, push)
Choose MailerLite if you want
- → 5x cheaper than Mailchimp for comparable features
- → Free tier covers 1,000 subscribers with full email builder
In depth
About each tool
Customer.io
Behavior-based email and push for SaaS
Customer.io sends messages based on what users actually do in your product. Founded by Colin Nederkoorn, “fundstrapped” (took some money but runs like bootstrapped). Took 18 months to hit $10k MRR, now at $100M ARR. Great for SaaS doing product-led growth.
MailerLite
Simple email marketing at great prices
MailerLite is email marketing without the bloat or the price tag. Founded in Lithuania by Ignas Rubezius, bootstrapped until acquired for $90M in 2022. 5x cheaper than competitors because remote team + Lithuanian base. Great for creators who want simple and affordable.
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